> Hi all,
>=20
> I have a battery powered project (either 4xAA/AAA or 3.7V LiPo) which
> has quite a few supply voltages. They are +5, -5, +3.3, and +1.5 - all
> at above 200mA preferably.
> I have spent a night searching through all the major sites to find the
> cheapest solution, as price is an important factor. I have various
> regulators that I like and use often, and obviously have a solution for
> the above, but I would like to hear about how others would approach
> this, for example if anyone knew of a cheap IC that would take care of
> the +3.3 and 1.5V lines, or even a switcher that would do all three
> positive ones. The only multi output regulators I have found are over
> $10, which is quite a bit more than the separate solution.
> Any ideas are most welcome, LDO, switchers, charge pumps, uC based
> switchers, discrete circuits, etc - as long as the price and reliability
> is good. Space is also a big issue though, so I need to avoid large
> footprint or through hole stuff. Efficiency matters, but I thought the
> +3.3 and +1.5 lines could be linear if necessary.
> TIA

I think you are in for two switchmode chips, one to do +/-5V and one with d=
ual output synchronous rectifiers for 3.3 and 1.5V. If you want any reasona=
ble efficiency you will need a synchronous rectifier for the 1.5V as a mini=
mum, the 3.3V you may get away with just a shotcky diode.

Linear Technology have some chips which will fit both positions.
--=20
Scanned by iCritical.

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.